Repulsive clamping static contact structure of low-voltage circuit breaker

Abstract

The invention discloses a repulsive clamping static contact structure of low-voltage circuit breaker. The two ends of a locating shaft are fixed on a support, the middle of the locating shaft penetrates a static contact and pressure springs which are respectively arranged at the two sides of the static contact, the pressure spring is enveloped in the support and causes a connector row to compact the static contact, the free end of the static contact is arranged in a through slot on the bottom wall of the support, a tension spring is arranged in a first through slot of the support and corner approach thereof is fixed on a first boss in the first through slot, and the other corner approach of the tension spring penetrates the other through slot on the bottom wall of the support and is fixedly connected with the free end of the static contact. The static contact structure of the invention is modularized, clamping structure is adopted to realize electrical connection between static contact and inlet wire row, contact resistance is less, service life of static contact of circuit breaker can be prolonged, assembly is simple, and production cost is low.

Description

technical field [0001] The invention relates to a static contact part of a molded case low-voltage circuit breaker. Background technique [0002] The electrical connection of the conductive system of the molded case low-voltage circuit breaker generally includes: the connection between the incoming line bar and the static contact, the connection between the moving and static contacts, the connection between the moving contact and the heating element, and the connection between the heating element and the outlet line, among which The connection of moving and static contacts is the most critical part of the internal electrical connection of the circuit breaker. When the circuit breaker breaks the current, an arc is generated between the moving and static contacts, which will cause wear to the moving and static contacts of the circuit breaker, and accelerate the migration of the moving and static contacts, which will affect the life of the moving and static contacts. At presen...

AI Technical Summary

Problems solved by technology

When the circuit breaker breaks the current, an arc is generated between the moving and static contacts, which will cause wear to the moving and static contacts of the circuit breaker, and accelerate the migration of the moving and static contacts, which will affect the life of the moving and static contacts

At present, when the breaking capacity of the molded case low-voltage circuit breaker is high, its static contact is generally a U-shaped structure that can be repelled. Generally, copper braided wire welding is used to connect the static contact with the connection row of the incoming line, but welding will damage the copper braided wire, and the resistance of the welding place is high, causing the temperature of the circuit breaker to rise during operation.

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